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Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of cash flow statement [Abstract] |
Disclosure of non-cash operating working capital |
Year ended Dec. 31 | 2020 | 2019 | 2018
(Use) source: |  |  |
Accounts receivable | (79) |  | 261 |  | 58 |
Prepaid expenses | 2 |  | — |  | 19 |
Income taxes receivable | (4) |  | (6) |  | — |
Inventory | 6 |  | (13) |  | (21) |
Accounts payable, accrued liabilities and provisions | 160 |  | (130) |  | (97) |
Income taxes payable | 4 |  | 9 |  | (3) |
Change in non-cash operating working capital | 89 |  | 121 |  | (44) |
Cash flows from (used in) operating activities |
| Balance Dec. 31, 2019 | Net cash flows | New leases |  | Dividends declared | Foreign exchange impact | Other | Balance Dec. 31, 2020
Long-term debt and lease obligations | 3,212 |  | 133 |  | 16 |  |  | — |  | 5 |  | (5) |  | 3,361 |
Exchangeable securities | 326 |  | 400 |  | — |  |  | — |  | — |  | 4 |  | 730 |
Dividends payable (common and preferred) | 37 |  | (86) |  | — |  |  | 107 |  | — |  | 1 |  | 59 |
Total liabilities from financing activities | 3,575 |  | 447 |  | 16 |  |  | 107 |  | 5 |  | — |  | 4,150 |
| Balance Dec. 31, 2018 | Net cash flows | New leases | Tax shield on tax equity financing | Dividends declared | Foreign exchange impact | Other | Balance Dec. 31, 2019
Long-term debt and lease liabilities | 3,267 |  | (70) |  | 133 |  | (35) |  | — |  | (42) |  | (41) |  | 3,212 |
Exchangeable securities | — |  | 350 |  | — |  | — |  | — |  | — |  | (24) |  | 326 |
Dividends payable (common and preferred) | 58 |  | (85) |  | — |  | — |  | 64 |  | — |  | — |  | 37 |
Total liabilities from financing activities | 3,325 |  | 195 |  | 133 |  | (35) |  | 64 |  | (42) |  | (65) |  | 3,575 |

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